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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1ce8ab12c4656ffd1a8b490273d37a211eed580eb66de24a064481314e184c' 
  AND token = 'x3nm7vJtsF17oD4zLUVkMb6NzQhXWk8ZvCGl07tbA6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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