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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2396d62fb4b9710134b637501f7177fdf9411c8b05cfd27c2d355b338fc7ea10' 
  AND token = 'raekLGvRrJL0xKBpnGMO51EJxtkJHGT9dFcmV3+5vm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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