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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f773ba6fd5e6b04f455928413b6dac27d5d324b1a7fd29b7f616684ac06cc0a2' 
  AND token = 'It6X/0H3P9oFdkRWVDSjB9DOi7hCFo/3qA4i978GJNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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