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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa02f9af924254972f23557b73281af2e3b83a2738cfab2e2ea4f451c5a4936' 
  AND token = 'FFd4ouK52B6W8GaK/jXIM3Mn9DRWmUU5/HW+6B8zflE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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