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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25c128d5cb4defe71a71991d1478d6437799d1ce746aa1a1b0b79151f8b6092' 
  AND token = 'P6tiihcTgGYp5xeIIBbccdz6gN5jecnwg3oM9mol+Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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