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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444593a24a8276c92e26b32e7d5f92b4d8b2793ca5be8678011dba55c4194d3b' 
  AND token = '9cAjLVL1u206Oa6QomOKp4XcAUXCXx5R3MjYjSahVpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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