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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea98171ff072093a2b9022910819fa1fd61925d720c3d4074fc0bbd04296a0a0' 
  AND token = 'HFFmF3TzBNMamqazAnMrs/eqlOA80+xcgBppw9uPIbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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