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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b861822dcfd647ce838d020347a85eb3c4345ac1754e4aa32b59607ea96ff5b6' 
  AND token = 'Khn0khs6G0iuAGbrfMydeiDxn5IuMt/6pHRf0o1Sas0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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