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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0208727010c438d09612a0c8879d06b3e812aa7a17cd5a8cdb3f15b3cd5a7d0f' 
  AND token = 'Tob9F5PC0Y1rE6D5TN/ukQASMRPDiN2CMeu0HNheBKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}