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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a628e84a97f408e15cb37af9072a030ffc7ea413e550ed4f733d4a674cc08c6' 
  AND token = '0S+L5PrDRRvWOzyVfcV1aj9Ls9YKwOKH5cRgVDtFaF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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