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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c8490fda8cbe2cffb70d93c5ada8fdbca933b4610ee50aa7bc396ec16e397e' 
  AND token = 'Ea7Md8upbFeahEOAZ2eaPdJ7SQ5oD6R35DEswqwErcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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