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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02dd07bf2dd0964d77b2656825afb3997311134082c47bc1496b16ded70bb24e' 
  AND token = 'R1gs6Ak9C+q5vEndhhB9UtHBKWhovp4FBtvxpG1J6GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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