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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b674e9068251c478591a37c2bcfdad9d4fd85a9932d65ba5ad97372a433a06' 
  AND token = 'nkff9epb5TmmguyHzgNMBpPOvm0QIwbJznSbKr5IgNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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