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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbd2f26a005d36e294aaca00e3e8caae6fabdf71ae33aa1763f4d05d3c7db96' 
  AND token = 'wVRZUCeNyQb0Ezi20cYJxpOqQyEUPIUM8EY/S7kuyKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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