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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c1b6826472374559d3a37279d0a5a72c1420eae5273bf2840dc8dc72dc6a75' 
  AND token = '9dPucwrc4Ygoq8hUxLvbqBKAWLMwMULqrtHGGQn9xXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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