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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006f56ae70971df71de697d71653de1ba3bbca5eaced5eeb3e4e7857715d00d4' 
  AND token = 'DMsCiwpPTwHUbuvZtxCaW9/n/0Gc474k6Otc9VyEOoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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