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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903e8c4be51cc8d4ffad699491daff01f4d18c8e2b1a6abec52168139cc46f42' 
  AND token = '7n4+25Lkoqa5VnIiB9bnMeni/g52nDGks9dAM+Do+9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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