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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d658f3a057708a3e312af8258aa31e45c690dfc7701abe2d3954e3f9ad0519a' 
  AND token = 'eZ9KUH2r06ZWreEjxQf30JX7aKU1cbi8GcHbXxMsx9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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