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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2871f8523f28abab242c61fd0b37e06df3007b28f19c2558a82e9f5f890569b' 
  AND token = 'K/S55j6ZjtLmXjcNKMx+5vow+vAs7gD4xDyqa5+alPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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