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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbaaa1b4b61611ff9d4098e9cb00cd8005d3aa8d94bdbedcc1f9509517933bf' 
  AND token = 'Ru8eUBHvjnneSD5By9k7W/3qMNwyyuhG/O17QxT98ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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