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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f53b3d34506665836873c279451705fc734b588553d1b6cccfb173629fd8dd4' 
  AND token = 'e9Pu+M8hR0s8fNL/YnOiOpU2RCr/IMYNArYlJJkICmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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