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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d7d3dfdf6598d5c936d9ea343cc1d608d0ddef5375ed1d29d534c565c4972a' 
  AND token = '3FGVaXhpVB+1OPrdTAXt0ScIHK+sRG/P4Xsh55z3ZcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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