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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be796629d3ebe89b3819d4c77293cdd089d97dd17daca5edcf1f2e514077831' 
  AND token = '73FBaqlIET0x4cYUt3N3zWT8X1+5Xsa1fEcuemLTF+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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