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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce279fa4233531ab1148be712db968f279c1f805d76ebde93e5d46a4a4c56809' 
  AND token = 'xZgIu0fiNFTEiNKitc305ZL+cOBr9/kIdedF71NxRyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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