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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7177c3a30e75747857b0814ec9cd869e91e21f61b936571dacf72a86da5d4e18' 
  AND token = 'pkiKv7BpAfHbfDW1VkRUAqJJH1yuc66YDKYdbGTLBFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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