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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cac88a5e83aa85d9198e80da53339ec4163959f917a62c5fc2fc45ecf850e9f' 
  AND token = 'QTsaD8jw7pW2B7JL8z1iJqtJHYQi0U3KwZ1c60UfJvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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