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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906c546ff6028543cf670c689e8df489989f555c9e40f12660000d32ebb9b4c3' 
  AND token = '6YyY0+ZPzKxnW+iDi+C9a67o4J9rhBpq+yCRVMIEFIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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