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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c622324876caca9abd1435ac81c03d5728e0c50c4bf066b4c62d001f12378b' 
  AND token = 'a9ke7v1rsEbHoFmn2b0j2ifC7jlse2lbxD+pnnIUIgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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