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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b61a57eb20efbbdfd7f8528690b066a06441b8426de48e0b938cbaf5dab1dc6' 
  AND token = '4MHsq87CIN8OPK38obEySa6htHiEYMSrS+Dw57m/mlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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