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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237a4f242cefad167f50bcaa568ede6505cf2960f9e400b78d73fdad055661ef' 
  AND token = 'E2Je1vnRJWshuP/tUcB7ZqbljB/w/hp+kdl6kET8W60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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