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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880aab4737eda4e87d3a74a7347de16270166fef263cc15457a5fada4d0988c5' 
  AND token = 'B/+SDFdgU0QFqcOT9ILcw8Y/8x8BtVB301uin6IVvL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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