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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00b9ad37c7f6cdc9dbddb6e99b9720676d3a02bdb604b64ed1ec830e08be971' 
  AND token = 'SS7jRZYrYbcNTRR1amJD+HzhpDFyX0kc+nReEqZyi4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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