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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14959a30517461da0187af0363eac1c46f5ce60bc23f5ace7396f1a346a7eac' 
  AND token = '7C70En+hrsXNul9J0ARvoRe49wjMTwOgvk62mlTbtiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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