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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76910f083c20b0b0258629dc7264667b3a1002488c0c3cd984645a6373de3f69' 
  AND token = 'fEONWw/wZrOiat7ntebFZ+1FurCul8VZxfvEWqdY++M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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