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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413a6ef11ab146e4642c0064df3086a07908ff2a499448e9e5edfa0622d877f1' 
  AND token = '1kFT66r+AfehBT4UvFNvB0VrVI2+HPWwTYpuOTPBLO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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