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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4421708c2ee788406da73d9d52ff1b8570950e70fa19d94766e68fe52743c624' 
  AND token = '5M0iy9KRZ0zO3GcbomeAisrxtdRoBKBTEJ+OGtdv1Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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