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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a8673317acaa0d77c3b2e4e4fa7f12f6617ba085e72e28a8b2793e6a31e6ac' 
  AND token = 'jmu/kIwyXX1Su+GhGodCGJSmEuEkCfYS77r6ibu95XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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