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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51cf42170d9a328797ceaf0167b77f7805ec198d7c815406860d97ebc7b33d37' 
  AND token = 'LCcIZIoILHX0wqi8FFZSkjCX6gfyk4uHMJTpP4zjV5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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