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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b1f1e9ff9da9a1801a8ca0e6910a39f74f78910086dcc25821bc85f671c6c6' 
  AND token = 'Zxu6gHQ5tuva8sh/n4n6snUnygHiYvRbDG/f58pB0Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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