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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996fc113ba4623e994b47c0390ad45e1d551d5b2a5adc64e2b0778ae9adc4914' 
  AND token = 'SNnKQ7vhcvG9BGmdleplQISqZwYNiuBbA0HzQaulo50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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