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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9b768cbb7c69d16ad9c1870aea386a23dfafa204978af8d2c6a2d1bf37f3ed' 
  AND token = 'OBEJdgNnv5+baIK1t4NABACnNF0gOZBqTLFC1AkFF64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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