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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c3afe48f0b131d2676c6fcb4f84b1105b7a376225dce9a6922291f2c0719d5' 
  AND token = 'GOh4jeE1iAmf7iSBgfeQzphJfYzyuCtY6otRjSbgeNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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