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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e8ad3e7f551f78f1b35dc4bc598b69598af40ab0de3685537f2faee23b4a69' 
  AND token = '0yQk1DAzX9567rbwFfWriZHiI+GftDF5L3RcjfQYOaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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