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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc24f5150678e8d102b47fe4ead20eef2a02e2385ebd3f31d246afbd0ad775c9' 
  AND token = 'QqrqWnYT2P6U3L7iEMFPb7PQ13bisVlMtu9ni1jvx2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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