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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e90abde121dbcd35a9f516b564ca96ee845d25ab955cb1c90d324a98f39fc74' 
  AND token = 'UvmI78Q8hZEN/fukK3LeQHlkKNqjAmRN/KS9tspsBzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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