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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676450030873436702c606b21a8a174aa4674a9dcaeda71dd97d74c8df8c2f3c' 
  AND token = 'Mia8pUYXnH6lAR01Y0gCvRAb3OvYTrlfEr9LLdKUJhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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