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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad6f955208c204b5039e7b32438479ecbe8def7f9d54445e7d7fc9cea3ee50b' 
  AND token = 'S/E0mHPb9ZNu/CwOo4xL2vNqDm302fvz3lsOSO+up4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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