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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b44885d4317d1dad6cf910624d65ec1da2ae07f2d9b49ea71b717fc9c3330a' 
  AND token = '050TuWbjU+nWsFybeT6H3N3Iyky6X+sA08dAjluU9ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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