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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f48e816cfac3ade392f60f39ad1518c69f9cb4089afab8c859920623460fa8c' 
  AND token = '/46SvYy/lPVb8GfjdL5yBPIFYvAal0LF9nUhgZrXamA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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