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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eaa9e29802e5db87afb4747414c8abe06909a5420f2464952118ec121eb3b15' 
  AND token = 'onJ2mVXvlfF1QtyOrQWCPOUt2sIJ5U9sFoBNXF5yV/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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