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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66dcd85427b692e6e84d84884af0b119eb6d0d45ad035175e4ffdc94138d4e83' 
  AND token = '8FaMS+KJBoAd0TzboAa0NshS5eYPcxn1L+YqPOTaZRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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