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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360095fc01591f753a2ae505b53877bcdda3bba609893806f368f8edeec3916e' 
  AND token = 'CO+5HOQSyQEltv3fFI/JiiQmCazhJrjAJwIKsJuj5qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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