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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eedd0f3ebd655908ac63d82912a7ff7c242ebc12e1f8803e8e64e213b26a6f84' 
  AND token = 'AmbM5MYYP4SzVqk83XQq0nQEqgTYCbO5abf7FuVVAw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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