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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d609e03284b2331dc56543a1884a8ea3aad5eb9d12a7365eb2fb2728d06e3d' 
  AND token = 'Dnmn8QbB60qvP4GuImcfke0viQycDJ491p70zwXDLIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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