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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8795a4968d7a80a53e48a50f418be145df44c58637ccf2427d3fe2d8d4b535c0' 
  AND token = 'nrsDCHKiUti2Tbr6nNTkqdTwBcUAOW3zAA6qnZDX/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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