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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a93faab409bc7f3da79db5567f5a217fd0beab8b1c1e2aad5b197a1e4822202' 
  AND token = 'SfZqH2MZWaAQ8iPYAhZYW7F+uEoGmMprmHPKGPpTr00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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