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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2a6ae63862ff18b54059071e9add2c334c874261f1c36065ae1fce2865c35e' 
  AND token = 'WzzvDP4RyqIS409kUf97vzeCgeZtUmhdxDouRcgW//4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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