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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3d67e8923a3e3377db2aa2b1518172d6ebfb8cf7d3d0707056dccf7fb51fa0' 
  AND token = '/G8k5SFDUC7BrYPhvImcW2/ZrbIol/nf9A0KfrgL9dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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