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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23619d29ed57877fc274c1bf8dcb59fdfd01e4b88df8ae8d6c6d722919a1fa44' 
  AND token = 'O9Gc6sCVGQ0WfiDSLqHg8NQkob5tsexUs2CXBDsA1cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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