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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5482b280c5426c8274b9832db2cd15bf617de78139cc80e54b00d4c92e49af' 
  AND token = 'ifIh2pwm8BuuLJdMR6XQ0SmM8JNmgyLCysBFowRz3lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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