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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a4686613fcf0069b17c64c23f2ec42505eb6b96cb0ba4d4be54998ce2f51b8' 
  AND token = 'qpP4JP3LUOR9TCK5/Ed4BNoNe3s93IakpGe/HdeWJXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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