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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079b3a875a56e358eab6c5c4c10add08b0eab811e85d8c63ba4b213a5f780418' 
  AND token = 'LhULUVrvNUuwvEvDdj6b+46TqjA6z31mLPd8npolkBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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